Yes, the new multifunction shoe on the R5 II will support the old-style hotshoe flashes mounted directly. As you say, the connection is functional but not weather sealed. If you need a weather sealed connection to old flashes, the AD-E1 adapter provides that.Support the Hotshoe the older Flash-Units ( ST-E3-RT for Example ) - i saw an Info -> yes but not sealed ?
( Using of my Flash-Systems )
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